/Engine/Source/Runtime/ApplicationCore/Public/GenericPlatform/Accessibility/GenericAccessibleInterfaces.h
If the current widget has no next sibling, search for the first ancestor from the current widget with a next sibling. Return that ancestor's next sibling.
The logical next widget in the accessible widget hierarchy.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IAccessibleWidget](API\Runtime\ApplicationCore\GenericPlatform\Accessibility\IAccessibleWidget) > GetNextWidgetInHierarchy()